ARK CLS Seismic Spectral Blueing V2.94 - OpendTect plugin version

82 Pages·2009·5.1 MB·English

ARK CLS Seismic Spectral Blueing V2.94 - OpendTect plugin version
ARK CLS Seismic Spectral Blueing V2.94 - OpendTect plugin version
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ARK CLS Seismic Spectral Blueing V2.94 -
OpendTect plugin version
ARK CLS Limited
Copyright © 2008 ARK CLS Limited
All rights reserved. No part of this publication may be reproduced and/or
published by print, photo print, microfilm or any other means without the written
consent of ARK CLS Limited.
Table of Contents
1. Introduction
2. Background and Theory
2.1. Basics
2.2. Benefits of Seismic Inversion
2.3. Inversion Limitations
2.4. Inversion techniques
2.4.1. Parametric Inversion
2.4.2. Coloured Inversion
2.4.3. Synthetic example
2.4.4. Real data examples
2.4.4.1. Comparison between Coloured Inversion and
Unconstrained Sparse Spike
2.4.4.2. Coloured Inversion used to Improving interpretation
2.4.4.3. Well Planning
2.5. Seismic Coloured Inversion (SCI)
2.6. Seismic Spectral Blueing (SSB)
2.7. References and Acknowledgements
2.7.1. References
2.7.2. Acknowledgements
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ARK CLS Seismic Spectral Blueing V2.94 - OpendTect plugin version
3. Quick Start - SsbQt Tutorial
3.1. Launching the SsbQt OpendTect plug-in
3.2. Selecting Data
3.2.1. Input Seismic
3.2.2. Input Well Log
3.3. Designing and Saving the Spectral Blueing Operator
3.4. Application of SsbQt operator
3.4.1. Testing the Spectral Blueing operator
3.4.2. Applying the Spectral Blueing operator
4. User Manual
4.1. Interfacing with the SsbQt Application
4.1.1. SsbQt Main Window
4.1.1.1. Menubar Area
4.1.1.2. Toolbar Area
4.1.1.3. Chart Area
4.1.1.4. Status Area
4.1.2. SsbQt Main Window ancillary tools
4.1.2.1. Save Operator
4.1.2.2. Import Chart Configuration
4.1.2.3. Export Operator
4.1.2.4. Export Data Item
4.1.2.5. Parameter Report
4.2. User interaction with Chart Area
4.2.1. Direct Interactions
4.2.1.1. Global Zooming
4.2.1.2. Identifying Data
4.2.1.3. Data Zooming
4.2.1.4. Moving Data
4.2.1.5. Changing Axes
4.2.2. Chart Controller
4.2.2.1. Creating a New Chart
4.2.2.2. Moving Charts
4.2.2.3. Deleting Charts
4.2.2.4. Saving and Loading Chart Configurations
4.2.2.5. Changing the Number of Columns
4.2.2.6. Zooming In and Zooming Out
4.2.3. Display Options
4.2.3.1. Chart
4.2.3.2. Management of Data Items
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ARK CLS Seismic Spectral Blueing V2.94 - OpendTect plugin version
4.3. Select Input Data
4.3.1. Input Seismic tab
4.3.1.1. Select trace data
4.3.1.2. Loading and Clearing Data
4.3.1.3. Modifying Time Range
4.3.1.4. Removing Bad Traces
4.3.1.5. Select Volume dialog
4.3.1.6. Horizon Input Dialog
4.3.2. Input Well Log tab
4.3.2.1. ASCII well log loading
4.3.2.2. Define ASCII File Format
4.3.2.3. Database well log loading
4.3.2.4. Modifying Time Range
4.4. Design Controls
4.4.1. Smooth Seismic Mean
4.4.2. Fit Well Log Curves
4.4.3. Design Operator
4.5. Advanced Controls
4.5.1. Frequency Domain
4.5.2. Design Operator
4.5.3. Time Domain
List of Figures
2.1. Seismic Method and Inversion
2.2. Synthetic comparison
2.3. Synthetic comparison in greater detail
2.4. Coloured Inversion and Unconstrained Sparse Spike example
2.5. Improving Interpretation example
2.6. Horizontal Well example
3.1. Attribute Set used to launch SsbQt
3.2. Seismic Spectral Blueing main window
3.3. Select Input Data Dialog (Input Seismic Tab)
3.4. Select Input Data dialog (Input Well Log tab)
3.5. Design Controls dialog
3.6. Seismic Spectral Blueing main window after analysis and design
3.7. OpendTect Spectral Blueing Processing
4.1. SsbQt main window
4.2. SsbQt main window - default configuration (showing the top four charts)
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4.3. SsbQt main window - default configuration (showing the middle four charts)
4.4. SsbQt main window - default configuration (showing the bottom two charts)
4.5. Save Operator dialog
4.6. Export Data Item dialog
4.7. Export Data Item dialog
4.8. Global Chart Area Zooming
4.9. Identifying Data from Charts
4.10. Data Zooming on Charts
4.11. Moving Data on Charts
4.12. Changing Scales on Charts
4.13. Chart Controller dialog
4.14. Create a new Chart
4.15. Moving Charts
4.16. Deleting Charts
4.17. Saving and Loading Chart Configurations
4.18. Changing the Number of Columns
4.19. Display Options dialog
4.20. Changing Chart Properties
4.21. Management of Data Items
4.22. Select Input Data dialog (Input Seismic tab)
4.23. Loading Seismic Data
4.24. Clearing Seismic Data
4.25. Modifying Seismic Time Range (Full)
4.26. Modifying Seismic Time Range (Sub)
4.27. Modifying Seismic Time Range (Horizon)
4.28. Removing Bad Traces
4.29. Select Volume
4.30. Select Horizon
4.31. Select Input Data Dialog - Input Well Log tab
4.32. ASCII Well Log Selection
4.33. Define ASCII File Format
4.34. Database Well Log Loading
4.35. Select Database Logs (OpendTect)
4.36. Generate Reflectivity Log (OpendTect)
4.37. Modify Well Log Time Range (Full)
4.38. Modify Well Log Time Range (Sub)
4.39. Modify Well Log Time Range (Horizon)
4.40. Design Controls Dialog
4.41. Smooth Seismic Mean
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ARK CLS Seismic Spectral Blueing V2.94 - OpendTect plugin version
4.42. Fit Well Log Curves block
4.43. Design Operator block
4.44. Frequency Domain Tab
4.45. Design Operator Tab
4.46. Time Domain Tab
Next
Chapter 1. Introduction
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Chapter 1. Introduction
Chapter 1. Introduction
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Chapter 1. Introduction
Observed behaviour of reflectivity data obtained from wells shows that in a global
sense that the higher the frequencies the higher the amplitude. We refer to this as
the spectrum being blue. During the processing of seismic data the amplitudes are
often whitened. Spectral shaping of seismic data using SSB can enhance resolution
without boosting noise to an unacceptable level.
SSB sections are usually easier to interpret and reveal more information about the
subsurface. Small scale faulting, not seen on the original section, are often
observed. Such additional information can be useful during well planning. SSB is
rapid, easy to use, inexpensive, robust and does not require expert users. SSB
seamlessly connects with third party seismic and well data repositories (including
SeisWorks, OpenWorks and GeoFrame) using our client/server technology. This
allows SSB analysis, operator design and processing to be performed without
separately importing or exporting data.
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ARK CLS Seismic Spectral Chapter 2. Background and
Blueing V2.94 - OpendTect Home Theory
plugin version
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Chapter 2. Background and Theory
Chapter 2. Background and Theory
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Chapter 2. Background and Theory
Table of Contents
2.1. Basics
2.2. Benefits of Seismic Inversion
2.3. Inversion Limitations
2.4. Inversion techniques
2.4.1. Parametric Inversion
2.4.2. Coloured Inversion
2.4.3. Synthetic example
2.4.4. Real data examples
2.4.4.1. Comparison between Coloured Inversion and Unconstrained
Sparse Spike
2.4.4.2. Coloured Inversion used to Improving interpretation
2.4.4.3. Well Planning
2.5. Seismic Coloured Inversion (SCI)
2.6. Seismic Spectral Blueing (SSB)
2.7. References and Acknowledgements
2.7.1. References
2.7.2. Acknowledgements
This chapter provides some background information and theory to Seismic
Coloured Inversion (SCI) and Seismic Spectral Blueing (SSB). The focus of this
chapter will be Seismic Coloured Inversion. However, the spectral analysis and
spectral shaping techniques discussed within also apply to Seismic Spectra
Blueing.
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Chapter 1. Introduction Home 2.1. Basics
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2.1. Basics
2.1. Basics
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2.1. Basics
Let us first consider the basis of Seismic Inversion. Acoustic Impedance is the product of interval velocity and density
and is normally represented by the equation:
Reflectivity(j) = V (j) * p(j)
p
where V is p-wave velocity
p
and p is density
Seismic reflections are given by the change in the Acoustic Impedance of the layers and are represented by the equation
RC(j) = ( Reflectivity(j +1) - Reflectivity(j) ) / ( Reflectivity(j + 1) + Reflectivity(j) )
Now the normal assumption is that the seismic trace is considered to be a primary only reflectivity model convolved
with the seismic wavelet which is summed with some uncorrelated noise and can be represented by the equation:
S(t) = R(t) * W(t) + N(t)
Figure 2.1. Seismic Method and Inversion

The figure above is a pictorial representation of the convolutional model. So, in simplistic terms the process of moving
rocks on the left to seismic on the right is termed the seismic method. On the left we have rock property Acoustic
Impedance (Reflectivity). So, moving left to right changes in Reflectivity at layer boundaries result in normal incident
reflection coefficients. Everywhere there is a reflection coefficient it is replaced by a wavelet which is centred and
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2.1. Basics
weighted by the reflection coefficient. These individual wavelets are summed and uncorrelated noise is added to
generate the seismic trace.
The process of seismic inversion takes us in the opposite direction trying to determine the Acoustic Impedance of the
individual rock layers.
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Chapter 2. Background and Theory Home 2.2. Benefits of Seismic Inversion
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2.2. Benefits of Seismic Inversion
2.2. Benefits of Seismic Inversion
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2.2. Benefits of Seismic Inversion
Listed below are some the benefits of seismic inversion.
1. More geoscientists understand the concept of impedance and geology than
the seismic trace. Thus, working in the impedance domain is a great
mechanism for integrating with the various disciplines in a
multidisciplinary asset team.
2. Removes the effects of the wavelet within the seismic bandwidth.
3. Forces well ties to be made and understood.
4. Reservoir properties are separated from the overburden.
5. May provide quantitative predictions on the reservoir properties.
6. Stratigraphic interpretation may be improved.
7. Interpreting in the impedance domain is frequently easier than in the
seismic domain.
8. Possibility of extending beyond the seismic bandwidth.
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2.1. Basics Home 2.3. Inversion Limitations
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